The ProStat PRS4210 Programmable Thermostat is compatible with multi-stage conventional or heat pump systems with up to two stages of heating and one stage of cooling and heat pump systems with one compressor and up to one auxiliary stage. - Standard Features:Single-stage conventional or heat pump systems - Multi-stage heat pump systems - Multi-stage conventional systems2-wire hydronic zone systems250mv - 750mv millivolt heating systems7 Day, 5-2 Day or Non-Programmable - Large 2 sq. in. display with bright blue backlight - Adjustable temperature limits for multi-family housing - Hardwire or battery powered - Permanent memory retains settings - Filter check monitor - Adjustable temperature differential - Adaptive Recovery Mode (ARM )ESD Guard electronic circuitry - Compressor short cycle protection - Temporary program override - Programmable extended hold mode - Front access reset button - F° / C° switch - ROHS Compliant - Trilingual packaging and instructions
